Well, fiddled. With the baffle idea. I took some material that is used for breather elements in machinery and cut it down to fit my Swift LT. I arched it over the vent holes so the air is out of the holes before it hits the mterial. Amazingly it is silent. See the pictures below.
I have a question for the more expert or engineering types. Is this sufficient for the expelled air to get out and stay out. Am I compromising anything in the design of the mask?